Barcelona sightseeing is a treat - there's never enough time to see everything that Catalonia's vibrant and beautiful capital has to offer. There's the cable car, the beach, Port Olympic, the Ramblas, Placa Real, the castle, and much, much more, including the Neu Camp Stadium. Depending on how much time you have, you can take a half day tour or take four day tour that includes Barcelona and the main sights around it. Or, coach tours and walking tours are also available, of various lengths and specific itineraries.
One specific tour theme which is always popular is tours based around the works of Gaudi. Gaudi is synonymous with Barcelona, the master architect who dreamed up many of the city's most iconic buildings. Some Barcelona tours allow you to skip the long entry queue to visit La SegradaFamilia, the cathedral that is Gaudi's unfinished masterpiece. You can also join walking tours of ParcGuell, to enjoy its amazing Tolkein-esque environment. Gaudi's sights are so popular that most Barcelona tours include at least one place associated with him.
There's a lot to see within an easy day trip from the city, too. Inland from Barcelona, Montserrat is Catalonia's most revered pilgrimage destination, and you can visit either as a regular tour group or as part of a smaller hiking party. You can visit this either together or separately from cava vineyards. Alternatively, you can splash out and book a helicopter trip to Monserrat, or book an excursion to the Pyrenees.
If you'd rather explore the Catalan coastline, then Tarragona was the former Roman capital of the region, and is well worth visiting for its chariot track and ornate cathedral. There are several holiday resorts along the south Catalan coast which have excellent beaches, and are worth visiting for a taste of the seaside. Port Aventura is one of Europe's largest theme parks and a perfect family day out.
And that's only just a small taste of the magical tours and excursions that Barcelona has to offer. Whatever time of year you go to the Catalan capital, and whatever your interests, you're guaranteed a holiday that you'll never forget.